package 单一职责.v3;

public class CourseImpl implements ICourseInfo, ICourseManager {

    @Override
    public String getCourseName() {
        return "fff";
    }

    @Override
    public byte[] getCourseVideo() {
        return new byte[0];
    }

    @Override
    public void studyCourse() {

    }

    @Override
    public void refundCourse() {

    }
}
